The Development Reason of CMM

With the improvement of people's living standards and the rapid development of manufacturing industry, especially machine tools, machinery, automobiles, aerospace and electronics industries, the development and production of various complex parts require advanced testing technology.

At the same time, in response to global competition, the production site attaches great importance to improving processing efficiency and reducing production costs. The most important thing is to produce high quality products.

Therefore, in order to ensure that the size and technical performance of the parts meet the requirements, accurate measurement must be carried out, so the three-dimensional measurement technology of the coordinate measuring machine came into being, and rapid development and increasingly perfect.

1. More and more workpieces need to be measured in three-dimensional space, and traditional measurement methods can not meet the needs of production.

The traditional measurement method refers to the measurement carried out by traditional measuring tools (such as dial gauges, measuring blocks, calipers, etc.), which belongs to relative measurement.

• The accuracy of the measuring tool is not high, and the human error is large
• The measuring range of the tool is small, and the size and shape of the workpiece to be measured are limited
• Many measurement tasks with more complex shapes, such as curved surfaces, are difficult to achieve
• It takes a long time

2. Due to the development of machining, CNC machine tool processing and automatic processing lines, the production beat is accelerated, and the processing of a part is only tens of minutes or a few minutes, which requires speeding up the detection of complex workpieces.

3. In the manufacturing industry, most products are manufactured in accordance with the CAD digital model on the CNC machine tool, it is compared with the original CAD digital model, to determine the error generated in the processing and manufacturing, it is necessary to use the coordinate measuring machine for measurement.

In the software system of CMM, the original CAD digital model can be displayed graphically, and then the measured point can be determined graphically according to the visual way, and the X,Y,Z coordinate values and normal vectors of the measured point can be obtained, and the automatic measurement program can be generated. CMM can accurately measure the workpiece according to the normal direction, obtain accurate coordinate measurement results, can also be compared with the original CAD digital model and display in a graphical way, generate coordinate detection report (including text report and icon report), the whole process is intuitive and fast, and the traditional detection method can not be completed.

4. With the increasing scale of production and the continuous improvement of processing accuracy, in addition to the need for high-precision CMM measuring room detection, in order to facilitate the direct detection of the workpiece, the measurement often needs to be carried out in the processing workshop, or the measuring machine is directly connected to the production line. With the increase of the number of inspection parts and the strengthening of scientific management, coordinate measuring machines of various precision are needed to meet the needs of production.

5. The need for reverse engineering.

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